After numerous cancer treatments and having suffered from two strokes in the past six months, Bob King was described as "in very bad shape" and "could barely see anything" by his wife, Jenny King.

He frantically grabbed the car door, but was too weak to push it open. King panicked.

Without a car key, he couldn't turn the air conditioning on. It was 91 degrees outside that day -- and the temperature inside the car had reached over 120 degrees.

That's when King spotted 3-year-old Keith Williams walking past the car. King knocked on the car window repeatedly and Keith stopped.

"I hollered at him and he just looked at me kind of funny and I said 'Get help, get help,'" King said.

Coincidentally, Keith's mother, Jessie Williams, had educated him about hot car safety just days before this happened. The toddler, who was barely three feet tall, was not strong enough to open the car door by himself. So he ran over to Pastor Jack Greene, who was volunteering at the benefit event, to get help.